206 lines
6.8 KiB
C++
206 lines
6.8 KiB
C++
// vi:ts=4
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// ----------------------------------------------------------------------------
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// UpTime - simple demonstration of lcd
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// Created by Bill Perry 2017-05-11
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// bperrybap@opensource.billsworld.billandterrie.com
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//
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// This example code is unlicensed and is released into the public domain
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// ----------------------------------------------------------------------------
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//
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// This sketch is for LCDs that are directly controlled with Arduino pins.
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//
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// Sketch will print "UpTime" on top row of lcd
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// and will print the amount of time since the Arduino has been reset
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// on the second row.
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//
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//
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// See below for configuring the Arduino pins used.
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//
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// If initialization of the LCD fails and the arduino supports a built in LED,
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// the sketch will simply blink the built in LED.
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//
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// While not all hd44780 use the same pinout, here is the one that most use:
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// pin 1 is the pin closest to the edge of the PCB
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// 1 - LCD gnd
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// 2 - VCC (5v)
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// 3 - Vo Contrast Voltage
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// 4 - RS Register Select (rs)
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// 5 - Read/Write
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// 6 - Enable (en)
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// 7 - Data 0 (db0) ----
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// 8 - Data 1 (db1) |-------- Not used in 4 bit mode
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// 9 - Data 2 (db2) |
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// 10 - Data 3 (db3) ----
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// 11 - Data 4 (db4)
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// 12 - Data 5 (db5)
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// 13 - Data 6 (db6)
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// 14 - Data 7 (db7)
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// 15 - Backlight Anode (+5v)
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// 16 - Backlight Cathode (Gnd)
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// ----------------------------------------------------------------------------
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// LiquidCrystal compability:
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// Since hd44780 is LiquidCrystal API compatible, most existing LiquidCrystal
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// sketches should work with hd44780 hd44780_pinIO i/o class once the
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// includes are changed to use hd44780 and the lcd object constructor is
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// changed to use the hd44780_pinIO class.
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#include <hd44780.h>
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#include <hd44780ioClass/hd44780_pinIO.h> // Arduino pin i/o class header
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// declare Arduino pins used for LCD functions
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// and the lcd object
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// Note: this can be with or without backlight control:
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// without backlight control:
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// The parameters used by hd44780_pinIO are the same as those used by
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// the IDE bundled LiquidCrystal library
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// note that ESP8266 based arduinos must use the Dn defines rather than
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// raw pin numbers.
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#if defined (ARDUINO_ARCH_ESP8266)
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const int rs=D8, en=D9, db4=D4, db5=D5, db6=D6, db7=D7; // esp8266 Lolin/Wemos D1 R1 (uno form factor)
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#elif defined(ARDUINO_ARCH_ESP32)
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// note: GPIO12 needs a pulldown resistor
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const int rs=12, en=13, db4=17, db5=16, db6=27, db7=14; // esp32 espduino32 D1 R32 (uno form factor)
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#else
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const int rs=8, en=9, db4=4, db5=5, db6=6, db7=7; // for all other devices
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#endif
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hd44780_pinIO lcd(rs, en, db4, db5, db6, db7);
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//with backlight control:
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// backlight control requires two additional parameters
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// - an additional pin to control the backlight
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// - backlight active level which tells the library the level
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// needed to turn on the backlight.
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// note: If the backlight control pin supports PWM, dimming can be done
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// using setBacklight(dimvalue);
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//
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// WARNING: some lcd keypads have a broken backlight circuit
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// If you have a lcd keypad, it is recommended that you first run the
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// LCDKeypadCheck sketch to verify that the backlight circuitry
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// is ok before enabling backlight control.
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// However, the hd44780_PinIO class will autodetect the issue and
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// work around it in s/w. If the backlight circuitry is broken,
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// dimming will not be possible even if the backlight pin supports PWM.
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//
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#if defined (ARDUINO_ARCH_ESP8266)
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// esp8266 Lolin/Wemos D1 R1 (uno form factor)
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//const int rs=D8, en=D9, db4=D4, db5=D5, db6=D6, db7=D7, bl=D10, blLevel=HIGH;
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#elif defined(ARDUINO_ARCH_ESP32)
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// esp32 espduino32 D1 R32 (uno form factor)
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// note: GPIO12 needs a pulldown resistor
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// Dimming will not work on esp32 as it does not have analogWrite()
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//const int rs=12, en=13, db4=17, db5=16, db6=27, db7=14, bl=5, blLevel=HIGH;
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#else
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//const int rs=8, en=9, db4=4, db5=5, db6=6, db7=7, bl=10, blLevel=HIGH;
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#endif
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//hd44780_pinIO lcd(rs, en, db4, db5, db6, db7, bl, blLevel);
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// LCD geometry
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const int LCD_COLS = 16;
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const int LCD_ROWS = 2;
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void setup()
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{
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int status;
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// initialize LCD with number of columns and rows:
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// hd44780 returns a status from begin() that can be used
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// to determine if initalization failed.
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// the actual status codes are defined in <hd44780.h>
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//
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// note:
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// begin() will automatically turn on the backlight if backlight
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// control is specified in the lcd object constructor
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//
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status = lcd.begin(LCD_COLS, LCD_ROWS);
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if(status) // non zero status means it was unsuccesful
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{
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// hd44780 has a fatalError() routine that blinks an led if possible
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// begin() failed so call fatalError() with the error code.
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hd44780::fatalError(status); // does not return
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}
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// if backlight control was specified, the backlight should be on now
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// Print a message to the LCD
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lcd.print(" UpTime");
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if(LCD_ROWS < 2)
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delay(3000);
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}
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void loop()
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{
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static unsigned long lastsecs = -1; // pre-initialize with non zero value
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unsigned long secs;
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int status;
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secs = millis() / 1000;
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// see if 1 second has passed
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// so the display is only updated once per second
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if(secs != lastsecs)
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{
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lastsecs = secs; // keep track of last seconds
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// set the cursor position to column 0, row 1
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// note: row 1 is the second row from top,
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// since row counting begins with 0
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// if display has only 1 line, it will appear on that line
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status = lcd.setCursor(0, 1);
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if(status) // non zero status means it was unsuccesful
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{
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// setCursor() failed so call fatalError() with the error code.
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hd44780::fatalError(status); // does not return
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}
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// print uptime on lcd device: (time since last reset)
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PrintUpTime(lcd, secs);
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}
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}
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// PrintUpTime(outdev, secs) - print uptime in HH:MM:SS format
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// outdev - the device to send output
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// secs - the total number of seconds uptime
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//
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// This is a fancy output routine.
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// outdev is a Print class object which indicates
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// where the output should be sent.
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// PrintUpTime can be used with any object that uses the Print class.
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// This code works with Serial objects, as well as the the hd44780 lcd objects.
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// i.e. you can call with Serial: PrintUpTime(Serial, seconds);
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void PrintUpTime(Print &outdev, unsigned long secs)
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{
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unsigned int hr, mins, sec;
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// convert total seconds to hours, mins, seconds
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mins = secs / 60; // how many total minutes
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hr = mins / 60; // how many total hours
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mins = mins % 60; // how many minutes within the hour
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sec = secs % 60; // how many seconds within the minute
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// print uptime in HH:MM:SS format
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if(hr > 99)
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hr %= 100; // limit hr to 0-99
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// Print class does not support fixed width formatting
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// so insert a zero if number smaller than 10
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if(hr < 10)
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outdev.write('0');
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outdev.print((int)hr);
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outdev.write(':');
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if(mins < 10)
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outdev.write('0');
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outdev.print((int)mins);
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outdev.write(':');
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if(sec < 10)
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outdev.write('0');
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outdev.print((int)sec);
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}
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